Improvement in grates for furnaces



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Grates for Furnaces.

Patented Dec. 29,1874.

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UNITED STATES PATENT Qrrrcn.

REUBEN A. HUTCHINSON, OF JERSEY CITY, NEW JERSEY.

IMPROVEMENT IN GRATES FOR FURNACES.

Specification forming part of Letters Patent No. 158,279, dated December29, 1874; application led August 7, 1874.

To all whom it may concern:

Be it known that I, REUBEN A. HUTcHrN- SON, of Jersey City, in thecounty of Hudson and in the State of New Jersey, have invented certainnew and useful Improvements in Grates for Furnaces, Ste.; and do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, making a partof this speciiication, in which- Figure l is a plan view of the upperside of my improved grate-bars as arranged for use. Fig. 2 is a likeview of the lower side of the same; and Figs. 3 and 4 are verticalsections upon the lines x x and z z, respectively, of said Figs. l and2.

Letters of like name and kind refer to like parts in each of thefigures.

My invention is an improvement upon a class of grate-bars which are usedmore especially in furnaces for boilers; and it consists principally ina series of bars, having their upper bearing-surfaces grooveddiagonally, and the grooves of contiguous bars arranged at an angle toeach other, substantially as and for the purpose hereinafter specified.It consists, further, in the peculiar construction of the pivotalbearings for the rocking supporting-frames, substantially as and for thepurpose hereinafter shown. It consists, iinally, in combining, with aseries of longitudinally-reciprocating grate-bars, a series ofstationary bars placed at each end of the lire-box, and overlapping theends of said movable bars, substantially as and for the purposehereinafter' shown and described.

In the annexed drawings, A and A represent a series of grate-bars,having the usual form, except that their upper surfaces are grooveddagon ally, and said grooves arranged so that, upon contiguous bars,they have an angle to, instead of a line with, each other. For a shortdistance near each end of said bars the grooved upper surface isremoved, for reasons hereinafter explained. The grate-bars A and A are,preferably, combined in sections of threebars each, but, it' desired,may be used singly. Upon the lower side of each bar, near each end, isformed a transverse half-round socket, a, which corresponds to and restsupon the upper edge of a frame, B, that extends transversely across theash-pit C, and at its lower end is pivoted so as to be capable ofimparting an oscillating movement longitudinally to said grate-bars. Twopivoted frames, B Vand B, are provided at each endl ofthe ashpit, andthe lengths of the grate bars or sections varied so as to enablealternate bars or sections to rest upon the same frames, the resultbeing that a movement of either pair of frames will give motion to butone-half of said bars or sections.

In order that all the grate-bars may be moved simultaneously a T-shapedlever, D, is suitably pivoted, near or at the front of the ash-pit C, insuch position as to bring its longer arm d outward, and its shorterarmsd andd in a line at a right angle to that of said bars. To each of saidarms d and d is pivoted oneend of a rod, E, which extends rearward, andis pivoted to or upon one of the frames B, while within the forward armd is provided a socket for the reception of a shaker-bar. F. As thusarranged it will be seen that, by moving the shaker-bar F laterally, inopposite directions, the frame-bars B and B, and the bars or sections Aand A resting thereon, will be caused-to reciprocate simultaneousl y inrelatively opposite directions.

As seen in Fig. 4, each frame B is made horizontal at its upper side andvertical at its ends, while from the lower portions of the latter anarch springs upward and across, and at its longitudinal center is joinedto the contiguous portion of said upper part. This form gives greatstrength to said frames, and prevents them froin becoming obstructed byan accumulation of ashes or clinlrers within the ash-pit.

In order to prevent obstruction to the pivotal bearings b and b of theframes B and B, the lower sides of the same are left open, as seen inFig. 3, and they rest uponpins or studs c and c that project laterallyinward from the sides of the ash-pit (l, the result being that ashes canfind no lodgnient.

At each end of the grate is provided a series of short stationary bars,A and A', which slope inward and downward, and extend over the planeportion of each bar A, and also between the ends of the contiguous bars,although the last-named feature. is not essential. The

office of the stationary bars is to form a housing or covering for theends of the movable bars, so that the latter may not become obstructed.

My grate is now complete, and possesses the following advantages: First,by grooving the bars diagonally, and arranging the grooves ot'contiguous bars at an angle to each other, 11o obstruction is offered tothe use of a slioer77 for separating the coal and clinker from saidbars, while the grinding action of the grooved edges as they move inopposite directions effectually break any clinker that may have formedbetween the same. Second, the construction of the pivotal frames affordsthe greatest strength, and prevents obstruction to the ash-pit. rIhird,the means employed for imparting a reciprocating motion in oppositedirections to the bars or sections is simple, efficient, and convenient,and is not liable to get out oforder. Fourth, by providing thestationary bars at the ends of, and immediately above, the movablegrate-bars all liability to obstruct at such point is avoided, and thefree working ot' the latter insured.

Having thus fully set forth the nature and merits of my invention, whatI claim as new 1s- 1. In a furnacegrate, a series of grate-bars, havingtheir upper surfaces grooved diagonally, and the grooves of contiguousbars arranged at an angle to each other, substantially as and for thevpurpose specified.

2. The pivotal bearings b and b of the frames B and B, made open attheir lower sides, and resting upon and combined with the studs c and c,in thel manner and for the purpose sub-

